Two of the modern era's biggest heavyweights are facing off in the Quarterfinals of March Metal Madness! Slipknot's "Duality" is up against Disturbed's "Down With the Sickness" as they vie for a spot in the Semifinals, looking to take home the title of Best Metal Song of the 21st Century.

Slipknot have had some of the most difficult matchups in the tournament, squaring off against the Drowning Pool anthem "Bodies" and then Five Finger Death Punch's "Coming Down." So far, Slipknot have proven to be as indomitable as they are onstage, netting over 57 percent of the votes in Round 2.

Disturbed's smash hit "Down With the Sickness" bested Ghost's Grammy-winning "Cirice" in the first round. Advancing to the next round, the song faced off against Anthrax's "The Devil You Know," imposing its will with just under a whopping 80 percent of the votes.

So which song will move on to the Semifinals of March Metal Madness 2016? Listen to both tracks and vote for either Slipknot's "Duality" or Disturbed's "Down With the Sickness" as the Best Metal Song of the 21st Century in the poll below!

(This poll will end on Tuesday, March 22, at 9AM ET. Fans are able to vote once per hour, so keep coming back to make sure your favorite song wins!)

Slipknot, "Duality"

Disturbed, "Down With the Sickness"